What is the lifespan of different blood cells?

Red blood cells live for about 120 days, platelets for 8-9 days, and white blood cells from a few hours to several years.

Red blood cells, also known as erythrocytes, have a lifespan of approximately 120 days. They are produced in the bone marrow and are responsible for carrying oxygen from the lungs to the rest of the body. After about 120 days, they are broken down in the spleen, liver, and bone marrow. The components are then recycled to make new red blood cells.

Platelets, or thrombocytes, have a much shorter lifespan, living for only about 8-9 days. They are also produced in the bone marrow and play a crucial role in blood clotting. When a blood vessel is damaged, platelets gather at the site and stick together to form a clot and prevent excessive bleeding. After their short lifespan, they are removed from the bloodstream by the spleen.

White blood cells, or leukocytes, have a highly variable lifespan, ranging from a few hours to several years. They are a key part of the immune system, helping to fight off infections and diseases. There are several types of white blood cells, each with a different lifespan. Neutrophils, the most common type, live for only a few hours to a few days. Lymphocytes, on the other hand, can live for years or even decades. This long lifespan allows them to provide long-term immunity against certain diseases.

In summary, the lifespan of blood cells varies greatly depending on their type. Red blood cells live for about 120 days, platelets for 8-9 days, and white blood cells can live from a few hours to several years. This lifespan is determined by the specific functions and needs of each type of cell in the body.